Answer: she can invite less than 108 guests to the reception and stay under budget.
Explanation:
Let x represent the number of guests that she can invite.
The meal price per guest is 28. It means that the meal price for x guests would be 28x.
She wants to spend less than her budget of 5,676, and Margaret has already spent 2,652. It means that the amount she has left to spend is
5676 - 2652 = 3024
Since she wants to spend less that 3024, then
28x < 3024
x < 3024/28
x < 108